Add a 120-second TX safety timeout that auto-releases PTT if no mic
data flows (browser crash, disconnect). Timer resets on each audio
callback. Shows countdown in status when < 10s remaining.
Add beforeunload handler that releases PTT via navigator.sendBeacon
when the browser tab is closed during TX.
Detect WebCodecs support on page load and show "Audio requires
Chrome/Edge" on non-Chromium browsers instead of silently failing.
Remove dead playBuffer/playNode variables that were declared but
never used. Fix TX AudioData to always use mono (channel 0) with
numberOfChannels: 1 matching the f32-planar format.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
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